now that's closed, it's possible to make our own fanmade
that is not how those things work. unless the creators put the ip into public domain or something similar.
also, what exactly are you even talking about? i see no such thing as bandai pulling their app https://play.google.com/store/apps/details?id=com.bandai.vitalbraceletarena&hl=e...
you sure there wasn't a "fan app" that was shut down by bandai... ?